JPH0984739A - Airtight structure of endoscope hand operating part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the insertion of an O-ring and prevent it from affecting the welded part of a connector member by using two kinds of hard and soft O-rings, and using them for positioning of the connector member to an opening part and for air-tightening. SOLUTION: As O-rings 38-42, two kinds of O-rings differed in hardness are used, the O-ring 38 situated on the outside end part of a through hole 34 has a high hardness so that a connector tube 36 is never shaken even when an external force is added to the connector tube 36, and is also formed with a small fastening margin with the through hole 34 so as to be easily inserted to the through hole 34. The O-rings 40, 42 have hardness lower than the O-ring 38, and are formed with the fastening margin with the through-hole 34 larger than the O-ring 38 so that airtightness can be held when the connector tube 36 is inserted to the through-hole 34 in the off-centered state. Thus, the O-ring 38 with high hardness can be easily inserted since the fastening margin with the through hole 34 is small, while the O-rings 40, 42 with low hardness can be easily inserted since the fastening margin with the through hole 34 is large but they are soft.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airtight structure of an endoscope near-end operating portion, and more particularly to a connector member inserted through an O-ring through an opening formed in a main body case of the endoscope near-end operating portion. Regarding the airtight structure of.

[0002]

2. Description of the Related Art In an endoscope operation section, a suction connector tube (connector member) is disposed in an airtight state through an O-ring through an opening formed in a main body case of the operation section. . This connector tube is connected to a suction device via a tube, and suction is performed from the tip end portion by operating the suction button of the hand operation unit.

[0003]

However, since the connector tube is brazed and welded to the suction valve, the dimensional accuracy is not high, so that the connector tube is eccentrically arranged in the opening of the main body case. There are cases. In such a case, since the tightening margin of the O-ring changes on the circumference, there is a drawback that the airtightness is poor at a portion where the tightening margin is small.

If an O-ring having a large tightening margin is used in advance to prevent such a problem, it becomes difficult to insert the O-ring into the opening, and if the O-ring is forced to be inserted, the O-ring will be O.
The reaction force due to the deformation of the ring may be transmitted to the brazed portion of the connector tube and the brazed portion may be damaged. Further, if the hardness of the O-ring is reduced to reduce the reaction force of the O-ring to prevent the brazed portion from being damaged, the connector pipe is apt to rattle against the opening, so that an external force is applied to the connector pipe. There is a drawback in that the rattling of the connector pipe that occurs when this occurs adversely affects the brazed portion.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an airtight structure for an endoscope near-end operating portion in which an O-ring can be easily inserted and a welded portion of a connector member is not adversely affected. And

[0006]

In order to achieve the above object, the present invention provides a connector member inserted and arranged through an O-ring in an opening formed in a main body case of an endoscope hand operation part. In the airtight structure of the operation section at the proximal end of the endoscope, at least two kinds of O-rings having different hardness are used as the O-ring, and the O-ring having a high hardness is formed with a small tightening margin with the opening so that the O-ring has a tighter margin. The O-ring having a low hardness is used for positioning the connector member, and the tightening margin with the opening is made larger than that of the O-ring having a large hardness, so that the O-ring is used for hermetically sealing the connector member with respect to the opening. Is characterized by.

According to the present invention, since the O-ring having high hardness is formed so that the interference with the opening is small, the O-ring can be easily inserted into the opening, and the O-ring having low hardness forms the opening. Although it has a large tightening margin, it is soft and can be easily inserted into the opening. Then, when an external force is applied to the connector member inserted through the opening, the O-ring having a high hardness used for positioning can suppress the backlash of the connector member, and the airtightness with the opening can be improved. It can be held by the O-ring having low hardness.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of an airtight structure of an endoscope hand operation portion according to the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a perspective view showing an external appearance of an endoscope hand operation unit 10 to which an airtight structure of the endoscope hand operation unit according to the present invention is applied. The endoscope near-end operating section 10 shown in FIG.
A freeze switch 14 and a suction valve 16 are provided side by side on the upper part of the main body case 12, and a relay board portion 18 of an eyepiece is provided on the rear end portion of the main body case 12.
Reference numeral 20 is a forceps hole, reference numeral 22 is a connecting tube accommodating a light guide cable and the like, and reference numeral 24 is an angle lever.

On the other hand, an opening 26 is formed on the side surface of the main body case 12 as shown in FIG. 2, and a lid 30 is attached to the opening 26 via a packing 28 in an airtight state. A cylindrical protrusion 32 is formed on the surface of the lid 30, and a suction connector tube 36 is hermetically sealed in a through hole 34 of the protrusion 32 through three O-rings 38, 40, 42 described later. It is arranged by inserting.

In FIG. 1, the base end portion 36A of the connector tube 36 is arranged outside the main body case 12 and is connected to a suction device (not shown) via a tube 44. FIG.
In, the tip end portion 36B of the connector tube 36 is welded to the lower end portion 46 of the suction valve 16 located inside the main body case 12 by brazing. By the way, the O-ring 38
For ~ 42, two types of O-rings having different hardness are used. O-ring 38 located at the outer end of the through hole 34
Is the connector pipe 36 even if an external force is applied to the connector pipe 36.
The hardness is high so that backlash does not occur in the through hole 3
The interference with the through hole 34 is formed to be small so that it can be easily inserted into the connector 4.

The O-rings 40 and 42 have a hardness lower than that of the O-ring 38, and the connector pipe 36 has the through hole 3 formed therein.
The tightening margin with the through hole 34 is formed to be larger than that of the O-ring 38 so that the airtightness can be maintained even when the O-ring 38 is inserted in an eccentric state. According to the airtight structure of the O-rings 38 to 42 of the connector pipe 36 thus configured, the O-ring 38 having high hardness has a small tightening margin with the through-hole 34, so that it can be easily inserted into the through-hole 34. Further, the O-rings 40 and 42 having low hardness are formed to have a large interference with the through hole 34, but they are soft and therefore can be easily inserted into the through hole 34.

Even if an external force is applied to the connector tube 36 inserted through the through hole 34, the connector tube 36 is positioned in the through hole 34 by the O-ring 38 having high hardness, and the backlash is suppressed. It does not adversely affect the brazed weld of the connector tube 36. Even when the connector tube 36 is eccentrically inserted into the through hole 34, the O-rings 40 and 42 having low hardness can maintain the airtightness.

Therefore, according to the airtight structure, the O-rings 38 to 40 can be easily inserted, and the connector pipe 36 can be easily inserted.
Even if an external force is applied to the connector pipe 36, the welded portion of the connector pipe 36 is not adversely affected. In the embodiment of the present invention, the airtight structure in the suction connector tube 36 has been described, but the invention is not limited to this, and other connector members inserted and arranged in the opening formed in the main body case 12 are also provided. Can be applied.

In the present invention, the O-ring 4 having a low hardness is used.
Two 0 and 42 are used, but one may be used.

[0015]

As described above, according to the airtight structure of the endoscope hand operation portion according to the present invention, at least two kinds of O-rings having different hardness are used, and an O-ring having high hardness has a small interference. The O-ring is formed to be used for positioning the connector member with respect to the opening, and the O-ring having a low hardness is formed to have a large tightening margin so as to be used for hermetically sealing the connector member with respect to the opening. Moreover, even if an external force is applied to the connector member, the welded portion of the connector member is not adversely affected.

[Brief description of drawings]

FIG. 1 is a perspective view of a hand operation section to which an airtight structure of an endoscope hand operation section of the present invention is applied.

FIG. 2 is a cross-sectional view of a main part of an airtight structure of an endoscope hand operation part.

[Explanation of symbols]

 10 ... End-of-sight operation part of endoscope 12 ... Main body case 16 ... Suction valve 30 ... Lid 34 ... Through hole 36 ... Connector tube 38 ... High hardness O-ring 40, 42 ... Low hardness O-ring

Claims (1)

[Claims] 1. An airtight structure of an endoscope near-end operating section in which a connector member is inserted and arranged through an O-ring in an opening formed in a main body case of the endoscope near-end operating section. At least two types of O-rings having different hardness are used, the O-ring having high hardness is used for positioning the connector member with respect to the opening by forming a small interference with the opening, and the O-ring having low hardness is the above-mentioned. An airtight structure of an endoscope hand operation part, characterized in that a tightening margin with the opening is formed larger than that of the O-ring having a high hardness so as to be used for hermetically sealing the connector member with respect to the opening.